alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET MALWARE Night Dragon CnC Beacon Inbound"; flow:established,from_server; dsize:16; content:"|01 50 00 00 00 00 00 00 00 00 00 01 68 57 24 13|"; threshold:type limit, count 1, seconds 60, track by_src; reference:url,www.mcafee.com/us/resources/white-papers/wp-global-energy-cyberattacks-Night-dragon.pdf; classtype:command-and-control; sid:2012304; rev:6; metadata:attack_target Client_Endpoint, created_at 2011_02_10, deployment Perimeter, confidence High, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)